Susannah Cahalan
Stephen Grywalski
Tom Cahalan
Rhona Nack
Margo
Richard
Allen
Giselle (as Jean MacLean Angus)
Senator
Dr. Najjar
Dr. Ryan
Dr. Khan
Dr. Siskin
Dr. Samson
Dr. Han
EEG Tech
Intern
Guy
Woman
Publicist
Young Waitress
Young Nurse
Performer in Club
Sid
MRI Technician
Cyclist with Bike (uncredited)
Nurse's Assistant (uncredited)
Journalist (uncredited)
Jaden (uncredited)
New York Post Reporter (uncredited)